41 km wireless p2p link connectivity line of sight very clear.
41 km wireless link is possible,minimum 10Mbps throughput which device you will be preferred (mikrotik or eny product)
Hello we have several links of 38 and 41 Km, then we are here on the forum Mikrotik so I’ll recommend these products and not others 
First of all I have not yet used the new models MT Netmetal that a reading of their characteristics are certainly the most appropriate for long links with high data transport.
Our experience on link of this distance provides for the use of:
2X RB911/912 http://routerboard.com/RB911G-5HPnD
2X mAnt30 http://routerboard.com/MTAD-5G-30D3
With clear LOS you can get a throughput between 20 Mbits and 40 Mbits full duplex,
cetalfio